Global warming is the chief culprit, but scientists want to know how this is happening. Both warmer air and warmer water are eating away at Greenland, causing it to lose billions of tons of ice daily in the summer.

A team of scientists and engineers aboard a research plane this week are dropping probes into the ice to help figure out which is the bigger cause.

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In this photo taken on Wednesday, Aug. 14, 2019, icebergs are photographed from the window of an airplane carrying NASA Scientists as they fly on a mission to track melting ice in eastern Greenland. Greenland has been melting faster in the last decade and this summer, it has seen two of the biggest melts on record since 2012. Mstyslav Chernov, AP

In this photo taken on Wednesday, Aug. 14, 2019, NASA project manager Ian McCubbin looks out of the window of a plane as they fly on a mission to track melting ice in eastern Greenland. Mstyslav Chernov, AP

In this photo taken on Wednesday, Aug. 14, 2019, NASA project manager Ian McCubbin, left, and NASA scientist Josh Willis check data from a probe that they just dropped from a plane as they fly on a mission to track melting ice in eastern Greenland. Mstyslav Chernov, AP

In this photo taken on Wednesday, Aug. 14, 2019, NASA scientist Josh Willis looks out of the window after dropping a probe from a plane as they fly above the Kangerlussuaq Glacier, eastern Greenland. Mstyslav Chernov, AP

In this photo taken on Wednesday, Aug. 14, 2019, NASA scientist Josh Willis prepares to release a probe from a plane as they fly above the Kangerlussuaq Glacier in eastern Greenland. Mstyslav Chernov, AP

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Indian school children hold saplings distributed by the government in Prayagraj, India , Friday, Aug. 9, 2019. More than a million Indians planted saplings as part of a government campaign to tackle climate change and improve environment in the countryâ€™s most populated state. (AP Photo/Rajesh Kumar Singh) Rajesh Kumar Singh, AP

Indian school children hold saplings distributed by the government in Prayagraj, India , Friday, Aug. 9, 2019. More than a million Indians planted saplings as part of a government campaign to tackle climate change and improve environment in the countryâ€™s most populated state. (AP Photo/Rajesh Kumar Singh) Rajesh Kumar Singh, AP

Indian school children hold saplings distributed by the government in Prayagraj, India , Friday, Aug. 9, 2019. More than a million Indians planted saplings as part of a government campaign to tackle climate change and improve environment in the countryâ€™s most populated state. (AP Photo/Rajesh Kumar Singh) Rajesh Kumar Singh, AP

Indian school children create art work related to environment awareness in Prayagraj, India , Friday, Aug. 9, 2019. More than a million Indians planted saplings as part of a government campaign to tackle climate change and improve environment in the countryâ€™s most populated state. (AP Photo/Rajesh Kumar Singh) Rajesh Kumar Singh, AP

An Indian schoolgirl creates an artwork for environment awareness in Prayagraj, India , Friday, Aug. 9, 2019. More than a million Indians planted saplings as part of a government campaign to tackle climate change and improve environment in the countryâ€™s most populated state. (AP Photo/Rajesh Kumar Singh) Rajesh Kumar Singh, AP

Indian school children hold saplings distributed by the government in Prayagraj, India , Friday, Aug. 9, 2019. More than a million Indians planted saplings as part of a government campaign to tackle climate change and improve environment in the countryâ€™s most populated state. (AP Photo/Rajesh Kumar Singh) Rajesh Kumar Singh, AP